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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00467bc9f93177e79a1a58728a81a6a4c84528ed3ec9e44b655dfefd64731170' 
  AND token = 'C4nA+19l8Qex3opB0+xuTpsN3+MgecUZxWytiZj3YnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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