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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec7215951d8990363a4e3a9a540a387471a4b4fa2633e2b63dfc300f0dd02d82' 
  AND token = 'ZzkV7MlH0upqQr2UXk7tKuHG8fjuausSxkYaY5+f23U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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