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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8286b6b75574e03b5847592c3cb6e0d8bef80416394357177283ba77cb510cd' 
  AND token = 'B/4BrTGSxM34G6U1FYT29DJhP01i6tdRkEsmc+dDdqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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