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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1345b3f13f72219eccc0dc1184ff0cbd9739ce7f615e88bd8e7bb237bfcfc9b' 
  AND token = 'J8a3AuygTwZwQDNykvp8x9cIIaoDvu5zA83ZaIo9kVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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