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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e314af455ece1a50e279fa6eba52adbe7f5ae3dc878a2a7a28af72b218cda7f' 
  AND token = 'VREiastk/ARHfRE5HkO0N6dEldfnRnevfkdOAz+kavk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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