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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '427e1111fb9cdadcc3a556ff0ae0fc890208e6db7f8dc4d13744eb7eb2402d0b' 
  AND token = 'Q4tY+rNe2V4Uxk/tCEWEucNzbs5X7upQNFe2ro6cssM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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