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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f515244957d2de3d8bda5c9286635eace8c4aa737891d006681612674d27b4e1' 
  AND token = 'R6zaLA6sgsHdrt0cEqdoV8NZx5Wdm6qSrdwAlb/cIzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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