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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '452ead45710e9ddc6ec6393ee01ad3646f267ea466df635e7ba83b3e36712a34' 
  AND token = 'OZ0ZYq7U1of1qeCgfhbmafINtpv1ACm8VKALaAttYSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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