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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b6def0233854d232d2d9465d0290cad20cfe672332e65a2a001e5bfdde6a3fd' 
  AND token = 'pwM1JJ1XbXa8jdcPOAwY1c6QXvjwCTezUdT0xioXDAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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