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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '588bcf65ca74e9d05b80b11e48a45f8d901f6d1dd5cfe451f6150d674788dd9e' 
  AND token = 'eYHBCIMsvp7XnF3OAfPtmmd8iU36pwq4ydIZXy0JTQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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