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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbdd7e1811c92f3a0ee4a3c3c418cd8d7d91e2e50332ff29b21be2d950a39de4' 
  AND token = 'ps+TIfRobDGLj5/BOUbVM0xe9nbVQhvH4/6+PyaGUAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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