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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a1bdcf07f7511310df937bf984d0813c21050d7067ee3c79c49a694fd78f27a' 
  AND token = 'vVhdn0MfiPWNKlH6E0ocgvt0Fv1HtjecI/I7p3uJKSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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