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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e4d269a3c2dafc19ad816ed3cfec6ecf15617136ddf72060035c527af7d0c24' 
  AND token = 'Bl01aU3FH6y+e35c0FSiwJvIsyW4OYBaZexJpW2J4p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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