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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73d02c9e569487ede405005a6b3f68e7e552a8ffc4842111dc227986d7ebad20' 
  AND token = 'YKPcAB6Iu2YHnFpdA13dLQb896k16hZaKenUrKo3pgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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