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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1a56b7ef0349d2ea37456b778fb0bace5e6e46478ea64fecd40bfe3c98018e9' 
  AND token = 'T5B/jDm5VuA2jt1QYSU7bPfMZsMs0Gpl6bJrQMV8PoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}