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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f610fd7cd6326c46fb1eab75f04cc8421993516ba04ea084000ddc566acfc0d' 
  AND token = '3iLe7GgJg5pKPpUzJ6ME1rXbUywEy6558VHkhGbzfzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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