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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b63102d17d349f776ab9acbcd09256c11c2f2dc75deaedb14b0e233e6113b297' 
  AND token = 'ewbsPfZ8kBakIh+GZLt1h1lE2JItMcr73j0K7m5aMao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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