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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7175cab5b13e60c4353d4fad339b66a5f95a6e9bdecb52593a416acdeca1546' 
  AND token = 'XIPKMrLlrKmiryaxvqc7P1tfO0y2ZHjGYfI0WdzQn6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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