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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b7e2f187dfbf5222a02b0bc265f1de81bb9270b31aa1d6c09ec528e4f2129d4' 
  AND token = 'k/+QFHS4OiJ9HfGQIbC5+1nAnj4Ts9H7vmJ+C5wCXgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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