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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32ad293ea3ff9d4a511554ed4531d0bfc9785781f25e13c7e3e3ca0d5783d9b0' 
  AND token = 'w1nDg0IqJIDOKg24NNiek/2osiJ+kn/aKuXmLwwk300=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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