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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87469df7e7bea38c478d02f9d21496d0fd9a7427c3743af3de42b5032b57804b' 
  AND token = 'rRfTt6m8TyOxnADHQxdk3C4+jiMjIKJscjxykaZ/5BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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