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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61a4335d20335f161f0cf6d88bff68a6524244e844fa8baf5ce3584585c10e30' 
  AND token = '2OfaxxQ1HOlcH+VXhN+rhnou+SCPrsTqKV+0ywXvG98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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