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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1b6344a21eb232e86fb67d0f9d29c4134a8d6bee224d1212f9b6caf9ba4cb28' 
  AND token = 'wCfisk+QeOi4wlwt5gwY1NROKKZ4A1/DEmSEGh1X9GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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