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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8d9284cefa1ade0c7c96be913da48b780347bc68e34b998bf1ac568af589afa' 
  AND token = 'qdS6HVJkbyaqzGrPi57ANkOtF8ZcakQw1oAiQKnqfJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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