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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41f1cdfb58d35b0a6a88104a333998f8cad3f2045ebc464e52052b61160379ab' 
  AND token = 'bnaOsDNStu0P0DuEII8GxCq6JrR11ailsqIT9mhxPkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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