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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c03aa39b0a1afe6120734de46fa23ace6d5caca640525e4091c3d6eea329456' 
  AND token = 'U+Z/nZgWh8sKvTJtftyG2B2Vz5RDgsc0p4zLfzuSDAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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