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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de99b1824ebafd5a56e76abf656f2800af27ed8ba7f77444455d32c715da00f4' 
  AND token = 'HDUIZCHtxzWFu/eixlS5Cs9bUP/sG6vd/oEez1J7TlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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