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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c18ae7cafa3d9e8ac0f491917ee54a6d9948f419747216618c391c2a301d0ee' 
  AND token = 'HmoTFfXhdH/UrEYG6HlM5vS+3DCii6Dsfhck9Se3qWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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