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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9191aa1c3aae38d1e5183887840e1d6f7c5ccdebacf9083fe84a681e98a6c36c' 
  AND token = 'QWHgCr9ONYn2nUO3lzvwkIsNM1op+zizGYOzw7TyGpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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