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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9edc55b8a3b9f3ee4a302a124a347ecb7e8aaa22c6be0fa6258a47c1f5b5bc5a' 
  AND token = 'U7jxLtQALFwKBwPQRHdzSUp5tBq1Vs1QE4k0uJRDhV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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