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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0089cfb199319d0f9d8320e74053f85184cd8836c352bd17c95847c1d4ad4f4' 
  AND token = 'ncjEglf3UuB88z/G2l7a0MxeVH91yLcpBnRArM9NXwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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