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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea930e6c675773508f49c389e3a6bfa6615b7e6546e6d934d159f7836c4bee1a' 
  AND token = 'yRttL/44bv2j8okkV6cFAxSS0CENcvRiDkxKrCP7Ihw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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