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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ea434f2d2f76ea1f8c6cc394b76214325dd9433ad84e0933d35e64eaaa34ee9' 
  AND token = '8yNxRf3qKNPlYSGPSMigGIJ7K9vkcz9Va74ahCA91qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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