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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7f95d59dde9dd008f27534502247d57735ef1a3b004724ca5b2d53e4427162f' 
  AND token = 'Gk9Mja+X5JvPObVZlzPeb7tppf8IZiG7XdqlmPig5To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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