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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ab46a8e7c4f10bb1bab6243bc91d237646edf346c1af4ed5b253d1c1e106ff3' 
  AND token = 'AtEZ4DYN21tP/wkbVjIPI29iqwMhADNU8U63Uaf/kX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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