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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb30a5a184209247ec8a7939080abe4386ad395d8d6e27b5c3e361cccddd9b2d' 
  AND token = 'RYRHxSpXvbMsKq0/Bjaue0AdNWBYqfT1jkiEhLlhv0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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