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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd8b93715962a39f9ea80f47de9700a4162776683cc8ffd20857cd65062de02a' 
  AND token = '4vOt0zxS8tfCGDVOVZeVMeyWB7yMnHBrtVR7KWUM9KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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