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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee71a0d156bc2872b71f4f555ef57cc01b16d9a6cf2e6e1f2ba7f8a2bcc53329' 
  AND token = 'qOA79eoocU0wCL0dDLcO1oDq6fiQqv/6Tlr/4HFp0UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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