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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e958bbd603fc2534f581c0db0ec307664b1ac8828495f68c8b3a38008c13e01' 
  AND token = 'Csusja7AOd9bH7xBD6iE+9JLAMrSA0vJOJxxUGv1S7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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