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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec2207de08493fcfcd4a880b9244e4617a8dba6dea6e8437a12706214c389a4e' 
  AND token = 'F9Qc+euCz8sP37jjHQupxiaoCVSWW3bemiWMH4BPHhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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