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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc4f1577f5096ca60b9ccde13c0113d13b5dccc452d2bc466a98efaf91658eb2' 
  AND token = 'FMeijoC4bA+sfph+bUfPJwHDjdiIUKbhSh/XTSez5zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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