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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d1d85440174526f0d4e05de5398e6696ad77a7f65ee0d5f4f49796792edf862' 
  AND token = 'HfrWwZgMIo4UG2dSr3+tlp7hJGhx2o43dkoVuGvvZ3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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