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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '541d13823c93ce3efc347af90cc8035640f56c0e8aea1eab25c9048e8d811736' 
  AND token = 'ej53DBUwzTpCJIFKqBm0b3lGR2BUHNcDPjCyqf42IlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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