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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f84ca514caed6dede7df5ebdc7af25724184c471a6a7b4a26afc321a2dea8f6e' 
  AND token = '6NeTbuTNZBLkhAhlR6U36QFNF58ufwkqYO1YQeZdlaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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