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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcd6268696f693cb7e619d2177cd64ea7142b272c92998ab516f451159517839' 
  AND token = '9TKtjNQc9nxW+u00lFfeJ+Wf1S63oKCZntjN6TRH1kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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