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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8accc9062e9c7391d8de1b2519a20d67053a9484db918243659779581cb529c6' 
  AND token = 'reAKuYBEDOIX8Jn4n9bCRAUFL45x1rr3SO+wxd0Aceo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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