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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f27af6cd17dcc89fdf1055a23f13e5f77f08aab2ca74ece95f7a0613056072e7' 
  AND token = '71NSYphrfdQnPfSUY3ljNtXUZQtT6VbN/nxs96u4EPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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