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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e74c2b6a097ee4c93dbe2d0ade2868d8056bfd335db029fc53af7af74f4e93f7' 
  AND token = 'L0zJNFmYcjQaZCSI4kamVmziCmhdbnIMJmU7+MkofYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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