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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebbd2d738479b7c8f43dd1ccf4038e27dd68ab905049b8dd212e3434166783dc' 
  AND token = '9mBhdAe+YNqY6usfVBi3gbkbiU00V3GTrL4bfSBCZdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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