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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11e6a59d85a49e33bac566d888291d0bb7f2d628ce8ccc8104eb7382949c81c3' 
  AND token = '2/y3rwuplj3Nz6TSDGns1IsYuyK29d73c/G7KX7VQ48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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