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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00162974036775490f97f976e648b6be10f69d8a31a0e32f9083787b8ba855e7' 
  AND token = 'fHVhBsVXhTQinWaHW3P0T0rqeUsCxgs7UNIlqqPotmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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