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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e7f911870a0c5b552fcaa9dadf5b78ae43e7e3ac5bed20edbcb1e980db19be9' 
  AND token = 'h/ZPdl4z4kFYeZlrVuKGVw5xSxHycdbKYzfUNaPNnow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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