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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84235cf173238ed5edac182afbaa3e10c0accc7630a2f4c4106d0622ce240160' 
  AND token = 'tHcn6MsoLjExIF6T3Wk3YrfmS0qN89s0XGVrb0o9zO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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