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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ce8c9bb3e8dd1090b714e1010fbee0bc8bcd82509c49d05826c5e4717ae5715' 
  AND token = 'mNZIAg3+Ed+MOKV2LhLFgFbU5ACx6iLDoC/J3LEQNXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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