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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '015494b82fede6f8128b513d7ced07a5a82b2684e07e75097fca9abd54a2e8e4' 
  AND token = 's78sYoOEfDaDrTVIlPTjsVGYAwobz/JDvxluzQ1don8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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