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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23c21e97f1755741fd18da3b0c80367f6340bfd7a0c5cb3cded5b8c5fadd71d6' 
  AND token = 'PgKya4e5F/LNXFr5/FcXlfrFxPDaeKf6NK/DhrlKxvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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