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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '079cd4aa1986c473027ec082faf20aeca93e740244ddf31f3c71aaa01f824f29' 
  AND token = 'ufWMm31E5C1rhXtj8+AwVjekntulWphLrau5GVm/v9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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