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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6aff8fcdf1861b830f4aa2168a0c93d42a90a498e68dcdb8a9d621a135fc6609' 
  AND token = 'MbR5CQ2AFtRAiif5mkDmLdXOXL+lqkTV+3gw1dICZJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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