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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27c79996da676617616aa087cdd8a0bd42d88c1456221d2aa7ec03de46172cbe' 
  AND token = 'CdPDZe7myKgtnM/hqikcC80jfMz/j72mEo/cgIrVxjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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