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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7eab38b36857d839a0df612ac69a5937d1e03b0d0c1c52e788e36d9ed0cbc104' 
  AND token = 'javvwenyPsp6DNlynffuaXdE4rd+6337vm+ahsIn5Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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