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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a87db461a5420c33755f2fb19f57b47893c2317022cc80f70531442eeb604b0b' 
  AND token = 'altQOEQXtRyEYExuYsUfHzF8AqRJkSuyFilo82fMBMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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